1. BSI 2009 BS EN 338:2009: Structural Timber – Strength Classes BSI London, UK
2. BSI 2010a BS 8006-1:2010 Code of Practice for Strengthened/Reinforced Soils and Other Fills BSI London, UK
3. BSI 2010b BS EN 14475:2006 Execution of Special Geotechnical Works; Reinforced Fill BSI London, UK
4. BSI 2013 BS EN 1912:2012: Structural Timber – Strength Classes – Assignment of Visual Grades and Species BSI London, UK